Python - 访问集合项
访问项
您不能通过引用索引或键来访问集合中的项。
但您可以使用 for 循环遍历集合项，或者使用 in 关键字查看集合中是否存在指定的值。
更改项
创建集合后，您无法更改其项，但可以添加新项。
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